基于几个黄土物性参数的震陷判定研究  

Study on determination of loess seismic subsidence based on several physical parameters

作　　者：徐舜华[1,2] 王兰民[1,2] 孙军杰[1,2] 

机构地区：[1]中国地震局地震预测研究所兰州创新基地,甘肃兰州730000 [2]中国地震局兰州地震研究所,甘肃兰州730000

出　　处：《世界地震工程》2010年第S1期90-93,共4页World Earthquake Engineering

基　　金：国家自然科学基金项目(50379049);中国地震局预测研究所基本业务项目(2009A18)

摘　　要：依据试验数据,研究了含水量、孔隙比和埋藏深度对黄土震陷性的影响规律,结果显示,黄土震陷临界含水量随着动应力的增加而减小,浅层黄土较深层黄土水敏性更强,在50~80kPa之间,临界含水量有一个急剧下降的特征;在典型黄土地区,黄土的孔隙比小于一定数值(宝鸡地区0.73、兰州地区0.86)时,震陷不会发生;在天然含水量情况下,黄土震陷深度曲线随动应力的增加经历了一个从平稳、快速、再收敛至最大震陷深度的发展过程。The law of water content,void ratio,and burial depth on seismic subsidence of loess based on experimental data is analyzed.The results show that critical water content of loess seismic subsidence decreases with the increase of dynamic stress,shallow loess water sensitivity is higher than the more deep one,and there is a sharp decline of the critical water content between the 50 kPa and 80 kPa.Seismic subsidence does not occur when typical loess void ratio is lower than a certain value(0.73 in Baoji and 0.86 in Lanzhou).In the case of natural water content,curve of loess seismic subsidence depth experiences a steady and fast development,and then converge to the maximum depth of seismic subsidence with the increase of dynamic stress.

关 键 词：黄土 震陷 含水量 孔隙比 埋藏深度 

分 类 号：TU435[建筑科学—岩土工程]